feat: Implement authentication service and login handling with role-based navigation

frontend/lib/screens/administrateurs/creation/gestionnaires_create.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+
+class GestionnairesCreate extends StatelessWidget {
+  const GestionnairesCreate({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Créer un gestionnaire'),
+      ),
+      body: const Center(
+        child: Text('Formulaire de création de gestionnaire'),
+      ),
+    );
+  }
+}

frontend/lib/screens/auth/login_screen.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:flutter/foundation.dart' show kIsWeb;
+import 'package:p_tits_pas/services/auth_service.dart';
 import 'package:url_launcher/url_launcher.dart';
 import 'package:p_tits_pas/services/bug_report_service.dart';
 import 'package:go_router/go_router.dart';
@@ -19,6 +20,7 @@ class _LoginPageState extends State<LoginPage> {
   final _formKey = GlobalKey<FormState>();
   final _emailController = TextEditingController();
   final _passwordController = TextEditingController();
+  final AuthService _authService = AuthService();
 
   @override
   void dispose() {
@@ -47,6 +49,46 @@ class _LoginPageState extends State<LoginPage> {
     return null;
   }
 
+  Future<void> _handleLogin() async {
+    if (_formKey.currentState?.validate() ?? false) {
+      try {
+        final response = await _authService.login(
+          _emailController.text,
+          _passwordController.text,
+        );
+
+        if (!mounted) return;
+
+        // Navigation selon le rôle
+        switch (response.role.toLowerCase()) {
+          case 'parent':
+            Navigator.pushReplacementNamed(context, '/parent-dashboard');
+            break;
+          case 'assistante_maternelle':
+            Navigator.pushReplacementNamed(context, '/assistante_maternelle_dashboard');
+            break;
+          case 'admin':
+            Navigator.pushReplacementNamed(context, '/admin_dashboard');
+            break;
+          case 'gestionnaire':
+            Navigator.pushReplacementNamed(context, '/gestionnaire_dashboard');
+            break;
+          default:
+            Navigator.pushReplacementNamed(context, '/home');
+        }
+      } catch (e) {
+        if (!mounted) return;
+
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text('Échec de la connexion. Vérifiez vos identifiants.'),
+            backgroundColor: Colors.red,
+          ),
+        );
+      }
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -144,11 +186,7 @@ class _LoginPageState extends State<LoginPage> {
                                   height: 40,
                                   text: 'Se connecter',
                                   textColor: const Color(0xFF2D6A4F),
-                                  onPressed: () {
-                                    if (_formKey.currentState?.validate() ?? false) {
-                                      // TODO: Implémenter la logique de connexion
-                                    }
-                                  },
+                                  onPressed: _handleLogin,
                                 ),
                               ),
                               const SizedBox(height: 10),